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The correct of boric acid opthalmic to use is a solution of 1.5 percent. The first step is to boil water so as to ensure it is clean and sterile. Using distilled water is also allowable. A quart of water and 1 teaspoon of boric acid opthalmic powder makes a good solution for eye wash. The solution helps to relief eye irritations and removes pollutants from the eye. People who are allergic to any form of boric acid should not use it.